Normally, this problem occurs if you language setting is different from your Keyboard language. All you need to do is change the setting of your keyboard language from Regional language settings from the control panel. Normally if your PC is pure US English, you should use English (US).

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System Preferences > Keyboard > Input Sources
Check to see correct keyboard is present in the sidebar to the left.
If you're dealing with multiple keyboard layouts, tick "Show input menu in menu bar" at the bottom of this same preference menu. Then check the input menu in the menu bar to see if correct keyboard is selected.
Let me know if this helps!

what email provider are you trying to use? can you log in through the web interface? you may need to adjust your actual account address in thunderbird settings, actually add your full address and not just your username or vice versa.

Welcome to FixyaDear UserYou DONT HAVE to Worry.Thats Wrong with Yahoo -Lot of People facing this Problem.Try after Few Hours

Check You Typed ID Correctly

Check if there is CAPS lock is ON

Try in Different Browser

Try in Different Computer

Try after Few Hours instead of trying Repeatedly [After Reboot or Later]

Still have TroubleYahoo did some upgrading and it caused a lot of bugs and it is affecting a lot of people. "You may experience problems accessing and getting your email. If you are using All New Emailtry switching back to Classic or vice versa to see if that will help...Let me know if you need further help...Hope this HELPED you[dont forget to Rate me]....Thanks for Contacting FixYa..

Clear your cache or cookies and flush your dns by opening a command prompt and typing: ipconfig /flushdns. Try to use a different browser. Like if you currently using Firefox, try opening yahoo mail wit IE, or vice versa.